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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b7cd4a5b91b5edff683b4fa8191678a387226d2d70d273c8ca5e177ee30e90' 
  AND token = 'vFUqWyDC70bdFC5Y0fOvS2fFV66fKtdPb9gmQ2w9wpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}